<template>
  <div class="todo-footer" v-show="totalNumber">
    <label>
      <input type="checkbox" @change="handleSelectAll" :checked="isAll" />
    </label>
    <span>
      <span>已完成{{ finishNumber }}</span
      >/全部{{ totalNumber }}
    </span>
    <button class="btn btn-danger" @click="handleDeleteFinsih">
      清除已完成任务
    </button>
  </div>
</template>

<script>
export default {
  name: "TodoFooter",
  // props:['todos','deleteFinish','selectAll'],
  props: ["todos"],
  methods: {
    handleDeleteFinsih() {
      //this.deleteFinish();
      this.$emit("deleteFinish");
    },
    handleSelectAll(e) {
      console.log(e.target.checked);
      //this.selectAll(e.target.checked);
      this.$emit("selectAll", e.target.checked);
    },
  },
  computed: {
    isAll() {
      return this.finishNumber === this.totalNumber && 0 < this.totalNumber;
    },
    finishNumber() {
      return this.todos.reduce((pre, current) => {
        return current.done ? pre + 1 : pre;
      }, 0);
      // return this.todos.filter((todo)=>{
      //   return todo.done;
      // }).length;
    },
    totalNumber() {
      return this.todos.length;
    },
  },
};
</script>

<style scoped>
.todo-footer {
  height: 40px;
  line-height: 40px;
  padding-left: 6px;
  margin-top: 5px;
}
.todo-footer label {
  display: inline-block;
  margin-left: 20px;
  cursor: pointer;
}
.todo-footer label input {
  position: relative;
  top: -1px;
  vertical-align: middle;
  margin-right: 5px;
}
.todo-footer button {
  float: right;
  margin-top: 5px;
}
</style>